Drawing roller



July 13 1926.

- c. GEGAUFF DRAWING ROLLER Filed Oct. 5. 1922 Patented Jul 13, 192s.

QFFICE.

CHARLES eneAUrr, or MULI-IOUSVE, rnAncE.

DRAWING- ROLLER.

Application filed October 5,1922, Serial No. 592,652, and in France October 10, 1921.

This invention relates to drawing rollers employed for combing in certain systems of l-Ieihnann combers and also in certain drawing frames, for example. for wool drawing frames such as gill-boxes and the like.

In both kinds of machines the drawing of the sliver lap takes place in the same way and the improvements to be described hereinafter are applicable to both types of machines.

The drawing means of these machines comprise usually a drawing roller and a pressure roller which is adapted to be pressed against the drawing roller while in some cases a leather belt or other endless band is interposed between the two rollers. On the rotation of these rollers the threads of the sliver lap to be operated on are drawn forward.

The rotation of the pressure roller and also the movement of the endless belt have hitherto been produced by the indirect action of the drawing roller owing to the adhesion of the surfaces of these three elements and it has been usual to increase this adhesion by grooves formed in the surface of the two rollers, while to ensure the endless belt being maintained at the necessary tension additional tension rollers have been provided for this purpose. The method of driving the pressure roller and the leather belt by simple contact under pressure with the drawing roller has hitherto been considered sufficient for the etficient working of the drawing device.

The present applicant has discovered however that the drawing power of the rollers will be considerably increased if an auxiliary driving means he applied to the pressure rollers and to the leather belt independently of the driving action already produced by their contact with the drawing roller. 7

Experience has shown that the nipping pressure between the two rollers may then be considerably reduced which allows without increasing their deflection of either employing rollers of smaller diameter which is anadvantage when working with small fibres or of increasing the width of the sliver lap to be operated on, or in other Figs. 1 and 2 are a plan and end elevation respectively of the auxiliary drive of the endless leather belt.

In these figures: A is the drawing roller;-

B is the pressure roller; C the tension roller and D an endless leather belt connecting the said rollers A and C.

The auxiliary drive of the endless leather I belt I) may be efiected by controlling the tension roller C of this belt by means of toothed wheels at b c as shown.

The wheel a is fixed on the drawing roller and the intermediate wheel 6 transmits the rotation of the cylinder A to the tension roller C which, for this purpose, has a toothed wheel 0 which meshes with the wheel b.

As shown in Fig. 2, the wheel 7) is mounted for sliding movement 01 its axis concentrically of the drawing roller A, in View to exert a tension eitect on the leather belt D through roller C.

It is obvious that tension roller C is a gravity tension roller.

The stretching or tension roller (or the belt) may further be operated only temporarily, that is to say only merely during the moment of the combing action of the comber which for example can be effected by means of a pawl (not shown) adapted to act on a ratchet wheel (not shown) firmly connected with the belt roller or pulley.

I declare that what I claim is In a I-Ieilmann or like combing machine the combination of a drawing roller, a gravity tension roller, a belt connecting the said rollers, a toothed wheel on the shaft of each roller and an intermediate toothed wheel engaging the first named toothed wheels and mounted for gravity movement of its axis concentrically of the drawing roller to exert a tension effect on the belt through the toothed wheel of tension roller.

In testimony whereof I aflix my signature.

CHARLES GEGAUFF. 

